.container {
  width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
}
.m-tit {
  text-align: center;
  font-size: 24px;
  padding: 25px;
}
.selector-wrapper {
  border: 1px solid #ddd;
  padding: 4px 12px;
}
.selector-wrapper .selector {
  display: flex;
  padding: 8px 12px;
}
.selector-wrapper .selector + .selector {
  border-top: 1px dashed #ddd;
}
.selector-wrapper .selector .selector-title {
  margin-right: 5px;
}
.selector-wrapper .selector .selector-items {
  flex: 1;
}
.selector-wrapper .selector .selector-items .item {
  display: inline-block;
  margin-right: 15px;
  cursor: pointer;
}
.selector-wrapper .selector .selector-items .item:hover {
  text-decoration: underline;
}
.selector-wrapper .selector .selector-items .item.active {
  color: #f00;
}
.item-wrapper {
  overflow: hidden;
}
.item-wrapper .item {
  float: left;
  display: none;
  border: 1px solid #ddd;
  box-sizing: border-box;
  margin: 15px;
  width: 270px;
  height: 150px;
}
.item-wrapper .item.active {
  display: block;
}
.item-wrapper .item .item-tit {
  padding: 20px;
  font-size: 16px;
}
